Guys , I'm new to this and have read and watched videos , trying to figure out what I'm doing wrong before bothering you all. Need some help please, have down loaded a stock tune file from repository, 2002 Silverado, to segment trans 4l80 into my 2002 tune file. Just cant get the segment tab to open , both files opened in compared folder. I've tried as much as I can find. Even downloaded again just to make sure I didn't corrupt it while closing. Any help would be greatly appreciated. Thanks